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BCG is generally given as vaccination in newborns. it theoretically prevents tuberculosis. to detect T.B. mantaux or tuberculin skin test is done.

tuberculin skin test could be negative in a number cases of tuberculosis. BCG VACCINE IS USED AS A TEST IN SUSPECTED TUBERCULOSIS DISEASE it produces accelerated reaction. induration >5mm within 48 - 72 hours, formation of pustule in five days , scar by 1 week.-- this is BCG challenge test.

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15y ago

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